System and method for estimating battery internal resistance online
A battery internal resistance and internal resistance technology, applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring electrical variables, etc., can solve the problem of difficult measurement of battery internal resistance
Active Publication Date: 2018-08-24
IND TECH RES INST
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Problems solved by technology
[0004] The purpose of the present invention is to provide a system and method for estimating the internal resistance of a battery on-line, which does not require additional devices, is not affected by the environment such as temperature, weather, and road conditions, and is not affected by charging or discharging. It can achieve the estimation of resistance and improve the problem that the internal resistance of existing batteries is difficult to measure
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[0027] see figure 1 The illustrated embodiment is a system 100 for estimating battery internal resistance online according to the present invention, which includes a high-voltage battery pack 10, a voltage sensing unit 20, a current sensing unit 30, an auxiliary battery 40, and a DC conversion The unit 50 , a driving unit 60 , an on-board charging unit 70 and a control unit 80 .
[0028] The system 100 for estimating battery internal resistance online according to the present invention is suitable for vehicles such as electric vehicles, hybrid vehicles or plug-in hybrid vehicles. The high-voltage battery pack 10 is used to provide a high-voltage power supply to drive the vehicle; the voltage sensing unit 20 is used to sense the total voltage value of the high-voltage battery pack 10; the current sensing unit 30 is used to sense the total current value of the high-voltage battery pack 10; the auxiliary battery 40 is used to To provide a low-voltage power supply for the vehicle...
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A system and method for estimating battery internal resistance online, suitable for electric vehicles or hybrid vehicles, the system includes a high-voltage battery pack, a voltage sensing unit, a current sensing unit, an auxiliary battery, a DC conversion unit, a drive unit, and an on-board charging unit and control unit. The total voltage value of the high-voltage battery pack is sensed by the voltage sensing unit; the total current value of the high-voltage battery pack is sensed by the current sensing unit; the low-voltage power supply is provided by the auxiliary battery; the high-voltage power supply is converted into a low-voltage power supply by the DC conversion unit and transmitted to Auxiliary battery; the vehicle is driven by the drive unit; the high-voltage battery pack is charged by the on-board charging unit; the control unit controls and measures the information of a fixed current for a period of time and the voltage difference before and after the fixed current to calculate the internal voltage of the high-voltage battery pack resistance.
Description
technical field [0001] The present invention relates to a system and method for estimating the internal resistance of a battery online, in particular to a method that can be used to calculate the battery by controlling and measuring the fixed current information for a specific period of time, and the voltage difference before and after the fixed current occurs. A system and method for online estimation of internal resistance of a battery. Background technique [0002] In the existing methods and strategies for estimating unit cell resistance, it is often necessary to partially unload the load end in order to correctly measure the internal resistance of the battery, especially for power supply equipment composed of many battery packs connected in series. If the internal resistance of the battery is measured without unloading, the detection signal will be shunted through the load end, which will affect the accuracy of the measurement; if the internal resistance of the battery ...
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IPC IPC(8): G01R27/08
CPCB60L2240/547B60L2240/549B60L58/20G01R31/3842G01R31/389Y02T10/70
Inventor 陈炳仁简士翔
Owner IND TECH RES INST